function zien(id){
	if(id!=null) var d=document.getElementById(id);
	// onzichtbaar maken van alles behalve de div id
	for(var i=0;i<submenuaantal;i++){
		if(document.getElementById('submenu'+i)) {
			obj=document.getElementById('submenu'+i);
			// zijn er submenu's
			if(d!=obj){
				/*
				var childarray=new Array("a","b","c","d");
				for(var j=0;j<childarray.length;j++){
					if(document.getElementById('submenu'+i+childarray[j])){
						if('submenu'+i+childarray[j]!=subid) invisible(document.getElementById('submenu'+i+childarray[j]));
					}
				}
				*/
				invisible(obj);
			}
		}
	}
	// zichtbaar maken van de div id
	if(d){
		visible(d);
		/*if(subid!=null) {
			visible(document.getElementById(subid));
		}*/
	}
}
function visible(objref){
	objref.style.display="block";
}
function invisible(objref){
	objref.style.display="none";
}
function mailnaar(naam, domein, tekst) {
	tekst=(typeof(tekst)=="undefined") ? naam+"@"+domein : tekst;
	document.write("<a href='mailto:" + naam + "@" + domein + "'>" + tekst + "</a>");
}
function testMail (email) {
	var regEmail = /^([\w-]+\.?)*\w+@([\da-zA-z-]+\.)+[a-zA-z]{2,4}$/
	return regEmail.test(email);
}
function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}
function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}
function tel(id) {
	if (window.XMLHttpRequest) {
		req = new XMLHttpRequest();
		req.open("GET", "tel.php?id="+id);
		req.send(null);
	} else if (window.ActiveXObject) {
		req = new ActiveXObject("Microsoft.XMLHTTP");
		if (req) {
			req.open("GET", "tel.php?id="+id);
			req.send();
		}
	}
}